* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    width: 100vw;
    height: 100vh;
  }
  
  canvas {
    display: block;
    position: fixed;
    left: 0;
    top: 0;
    width: 100vw;
    height: 100vh;
  }

  li {
    list-style: none;
  }